The below link is to an article from the victorious.com page about when and how to use Intelligence checks in Victorious. It is however generic enough to be of use to anyone playing a Siege Engine RPG.

"At NO time should the GM simply tell them the full resolution. This seems like the easier course for everyone, but players like to feel that they were the ones who came up with the right idea, or the right connections, or whatever to succeed at the scenario. Genteel Magistrates who just give their players everything they need to know on a successful Intelligence check removes that feeling of success from the players, and boredom with the game may ensue"

"And so I am become a knight of the Kingdom of Dreams and Shadows!" - Mark Twain

Thanks Lurker! It seems obvious on retrospect, but I've been surprised (and dismayed) at how many RPGers seem to miss that point. Its not so bad for FRPGs based on the OSR A/D&D paradyme but most skills heavy games run into this again and again, at least in my experience.